Specifications

General Maintenance 4
5975 Series MSD Troubleshooting and Maintenance Manual 147
To reinstall the heater and sensor in the ion source
Materials needed
• Gloves, clean, lint-free
• Large (8650-0030)
• Small (8650-0029)
• Hex ball driver, 1.5 mm (8710-1570)
• Hex ball driver, 2.0 mm (8710-1804)
• Hex nut driver, 5.5 mm (8710-1220)
• Source heater assembly (G3169-60177)
Procedure
1 Unpack the new source heater assembly. The heater, temperature sensor,
and heater block are already assembled.
2 Reinstall the repeller, repeller insulators, washer, and repeller nut
(Figure 24). The resulting assembly is called the repeller assembly.
3 Connect the repeller assembly to the source body.
4 Reinstall the filaments.
5 Reinstall the ion source in the source radiator. See the Operation Manual.
6 Reconnect the wires from the feedthrough board to the ion source.
7 Reconnect the heater and temperature sensor wires to the feedthrough
board.
8 Close the analyzer chamber.
9 Pump down the MSD.
CAUTION
Do not overtighten the repeller nut or the ceramic repeller insulators will break when
the source heats up. The nut should only be finger-tight.